Noun
forked stick that is said to dip down to indicate underground water or oil
Source: WordNetA Y- or L-shaped twig or rod, called a dowsing rod, divining rod (Latin: virgula divina or baculus divinatorius), a "vining rod" or witching rod is sometimes used during dowsing, although some dowsers use other equipment or no equipment at all. Source: Internet
The dowser then walks slowly over the places where he suspects the target (for example, minerals or water) may be, and the dowsing rod dips, inclines or twitches when a discovery is made. Source: Internet